1
我需要做一個活動（沒有佈局），在開始時檢查服務是否正在運行。如果它是真的，則啓動Activity2，如果它爲false，則啓動Activity1。 我試着用這個代碼：Android活動檢查服務啓動另一個活動
public class FirstActivity extends Activity{
private final Intent serviceIntent = new Intent(ServiceConnected.class
.getName());
private ServiceConnected serviceConnected;
private final ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
serviceConnected = ServiceConnected.Stub.asInterface(service);
Log.e("Connessione al Servizio", "onServiceConnected");
Toast.makeText(FirstActivity.this, "Connessione con il Service Effettuata", Toast.LENGTH_SHORT).show();
}
@Override
public void onServiceDisconnected(ComponentName name) {
Log.e("Disconnessione dal servizio", "onServiceDisconnected");
Toast.makeText(FirstActivity.this, "Scollegamento effettuato", Toast.LENGTH_SHORT).show();
}
};
@Override
public void onCreate(Bundle savedInstanceState){
setContentView(R.layout.firstactivity);
super.onCreate(savedInstanceState);
bindRemoteService();
Log.e("Dopo Bind onCreate","FirstActivity");
if(serviceConnected!=null)
try {
boolean temp=serviceConnected.getConnected();
Log.e("ServiceConnected",Boolean.toString(temp));
if(temp==true){
Log.e("Salto alla seconda","FirstActivity");
step2();
}
else{
Log.e("Salto alla prima","FirstActivity");
step1();
}
} catch (RemoteException e) {
// TODO Auto-generated catch block
Log.e("Errore Step","FirstActivity");
}
}
public void bindRemoteService() {
if (serviceConnected == null) {
if(bindService(serviceIntent, serviceConnection,
Context.BIND_AUTO_CREATE)){
Log.e("Bind Effettuato", "bindRemoteService");
Toast.makeText(this, "Service Binded", Toast.LENGTH_SHORT).show();
}
}
}
private void step2(){
Intent intent;
intent=new Intent(getApplicationContext(), Activity2.class);
startActivity(intent);
}
private void step1(){
Intent intent;
intent=new Intent(getApplicationContext(), Activity1.class);
startActivity(intent);
}
enter code here
，但是當我檢查，在onCreate方法，如果serviceConnect = NULL我收到一個某個時候NullPointerExcption！
我想也插入在一個異步任務的方法的onCreate操作：
private class BackgroundWorker extends AsyncTask<Void,Integer, Void> {
@SuppressWarnings("unchecked")
@Override
protected void onPreExecute() {
Log.e("BackgroundWorker","onPreExecute");
super.onPreExecute();
}
@Override
protected Void doInBackground (Void... params) {
Log.e("Dentro Background Worker", "DOIN");
bindRemoteService();
publishProgress(1);
//publishProgress(2);
return null;
}
@SuppressWarnings("unchecked")
@Override
protected void onProgressUpdate (Integer... values) {
try{
do{
try {
if (serviceConnected!=null&&checked==true){
boolean temp=serviceConnected.getConnected();
if(temp==true){
Log.e("Salto alla seconda","FirstActivity");
Log.e("ServiceConnected",Boolean.toString(temp));
step2();
}
else if(temp==false){
Log.e("Salto alla prima","FirstActivity");
Log.e("ServiceConnected",Boolean.toString(temp));
step1();
}
}
} catch (RemoteException e) {
// TODO Auto-generated catch block
Log.e("Errore Step",e.toString());
}
}while(checked==false);
}catch(Exception e){Log.e("Errore do",e.toString());};
}
}
但我有同樣的問題。有人知道我如何解決這個問題？ 謝謝
感謝您的回覆。我知道，但我不知道該如何等待 – zerocool87 2010-09-10 20:19:28
@ zerocool87：將你的代碼從'onCreate（）'調用到'bindService（）'後調用'onServiceConnected（）'。在'onServiceConnected（）'之前，您不會查看'serviceConnected'。坦率地說，我認爲你需要一種解決問題的方法，可能會將Activity1和Activity2合併成一個單獨的活動，所以你不必做出這個決定。 – CommonsWare 2010-09-10 21:27:49